Bluetooth version: Bluetooth 4.1/Bluetooth 5.0Interface type: 3.5mmProduct size: 5.9*1.5*1.2cmProduct bare weight: 12g (Bluetooth receiver + metal adapter)Total weight: 25g Packing size: 40*30*30cm basic skills:Product features: Bluetooth receiver, car Bluetooth receiver, car Bluetooth receiver, AUX Bluetooth receiver, audio adapterVoice prompt: supportOne for two: supportPairing timeout shutdown: The pairing state lasts for 5 minutes and then shuts down.Low battery reminder: when the voltage is less than 3.2V, reminder once every 5 seconds, 3.1V shutdown  Music control:Play pause: short press MFBPrevious song: VOL - long press for 2 secondsNext song: VOL+ long press for 2 seconds Telephone control:Answer the call: Short press MFB when callingHang up the phone: press MFB when callingRedial without number: double-click the MFB button, then short press MFB to cancel the dial-out Led light shows:Boot pairing: red and blue lights alternately flashConnection status: blue light flashes slowly (5 seconds 1 time)Low voltage: red light flashes (0.5 seconds 1 time)